Every king needs an heir. To help you groom a successor, this $12 million estate includes not only a master suite but a "junior" master bedroom as well.

The two bedrooms make an impressive pair, but rest assured: The senior master is the more impressive of the two. According to the Saunders listing, it features "numerous amenities," and the bedposts are taller. The little prince, though dodging the pedestrian "three other guest bedrooms," will still be reminded of his subordinate status. Helping to stave off mutiny is the loft on the second floor, where father and son can spend quality time together in a space designed for "study/play."

The property includes enough amenities for the "junior" master to appropriate a few without his senior counterpart minding. The kitchen has "work surface for several cooks," whom the two masters can allocate as they deem fit. And when the junior master starts dreaming of bigger things, the property, conveniently, spans an easily dividable two acres. — William Alden